Lug Sole Boots are any styling of boot that has a heavy, rubber (or other synthetic) outsole. Lug Sole Boots will typically feature a rugged tread on the outsole.
About Zipper:
A zipper, sometimes called a 'slide fastener' is a device consisting of two toothed tracks or spiral metal or plastic coils, each bordering one of two edges to be joined, and a piece that either interlocks or separates them when pulled.